Yes, but there should also be food/other activities included in the price.
Yes, if it was kid-friendly (not too scary).
Yes, if it was aimed at teenagers/adults (extremely scary).
I would, but I don't think my friends would enjoy it.
No, but they would visit if it were free.
No, it would not be a popular attraction.
No, Madeira isn't the right demographic for a haunted house attraction.